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# SERVICE BULLETIN Customer Support ATA SYSTEM: 3200 NUMBER: 84 ---32 ---28 

### BOMBARDIER AEROSPACE REGIONAL AIRCRAFT CONSIDER THIS SERVICE BULLETIN TO BE PARTICULARLY SIGNIFICANT AND URGES OPERATORS TO PROMPTLY EVALUATE THE CONTENTS

SUBJECT: Landing Gear --- Nose Landing Gear --- Replacement of Pushrod Assembly to Substitute T4 with a T6 --- ModSum 4 ---113457

1. PLANNING INFORMA TION A. Effectivity Aircraft Affected: In ---Service: DHC ---8 Aircraft Models 401 and 402 Serial Numbers 4003 thru 4005, 4009 thru 4011, 4016, 4017, 4024 thru 4072. NOTE: The instructions in this Service Bulletin are only applicable to the systems and parts installed at the time of delivery on the aircraft or as changed by Bombardier Aerospace Service Bulletin(s). Before you do this bulletin, examine all STC or equivalent action changes to make sure this bulletin can be completed. Spares Affected: The following is a list of spares affected by this change. Review spares and procurement systems to determine the existence of any listed parts. See Paragraph 2.D., Existing Parts Accountability, for disposition.

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.. .. .. Part Number Description Remarks 83232012 ---001 Pushrod --- Nose Landing Gear Manufactured after September 2000 B. Reason Problem: Some pushrods may have been incorrectly manufactured with tubes having the wrong heat treat condition using 6061 ---T4 instead of 6061 ---T6. C. Description The procedures in this service bulletin give the instructions to do the tasks that follow: --- the affected pushrod is removed, destroyed and discarded --- a new pushrod is installed. A functional test of the nose landing gear doors is performed D. Compliance Bombardier Aerospace highly recommends that this modification be incorporated at the operators earliest opportunity, unless otherwise directed by their Airworthiness Authority. E. Approval The technical content of this service bulletin has been approved under the authority of the Transport Canada Civil Aviation (TCCA) Design Approval Organization No: DAO #93 ---Q ---02. F. Manpower It will take an estimated 3 man ---hours to complete this service bulletin. The breakdown of the man ---hours is shown in the table that follows: TASK MAN ---HOURS Job Set ---Up 0.00 Procedure 2.00 Test / RTS 1.00 Close ---Out 0.00

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.. .. .. G. Material --- Price and Availability ModKit 8MK4279 ---001 is available through the Customer Accounts Service Team at Bombardier Aerospace Regional Aircraft division. Operators should submit a purchase order specifying aircraft serial number(s) to: Bombardier Aerospace Customer Accounts Services Team (Mail Stop N11 ---32) 123 Garratt Blvd. Toronto Ontario Canada M3K ---1Y5 Facsimile: (416) 375 ---3060 Telephone : (416) 375 ---3920 Kit Number Description Price (US$) Delivery 8MK4279 ---001 Retrofit Kit ---Pushrod Replacement, Nose Landing Gear Quoted at time of order Will be given at time of order

H. Tooling --- Price and Availability None I. Weight and Balance None J. Electrical Load Data Not affected K. Publications Affected Dash 8 Illustrated Parts Catalogue PSM 1 ---84 ---4

.................... ModSums Manual PSM 1 ---84 ---12

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.. .. .. L. References The initial issue of this service bulletin was prepared to the engineering drawings and related data that follows: DRAWING SHEET REV 8MK4279 1 A ModSum 4Q113457 Rev. ‘B’ ModSum 4 ---113457 Rev. ‘B’ PCA 40535 Revision --- --- (for internal reference only) 2. MATERIAL INFORMA TION A. Parts Required Per Aircraft (1) Modification Kit 8MK4279 ---001 (2) Detailed Kit Content:

Quantity Per Kit ---001 Part Number Description Remarks

1 8MK4279 Kit Drawing 2 MS24665 ---153 Cotter Pin 4 AN960 ---516 Washer 1 83232012 ---951 Pushrod ---NLG B. Parts Required to Modify Spares None C. Special Tools and Equipment Required None

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.. .. .. D. Existing Parts Accountability The following parts may be affected by this service bulletin. Indented parts are components of the next higher assembly. The quantity (Qty.) column lists the quantity that may be affected per aircraft for non ---indented parts and the quantity per next higher assembly for indented parts. Existing Part Number Description Qty. IC DC New Part Number PNC 83232012 ---001 Pushrod 1 B DIS 83232012 ---951 S IC Interchangeability Code A Not interchangeable. B Removed Part. No direct replacement. C Conditionally Interchangeable. Installation of superseded part negates the intent of this service bulletin. DC Disposition DIS Discard Part. MUI Multiple Usage Item: Return to stock if serviceable. RWK Rework existing part in accordance with this service bulletin. RWI Rework existing part per ..... SAL Salvage. Return to operator’s stores for salvage consideration. PNC Part Number Code N No equivalent Bombardier Inc. part number for reworked part. Indicate on part that this service bulletin has been accomplished. R Part number after rework. S Superseding or equivalent part number. X Reworked part and superseding part are functionally and physically equivalent but not identical. 3. ACCOMPLISHMENTINSTRUCTIONS A. Job Set ---Up (1) Either pull and clip circuit breakers required to isolate affected circuits or placard and select aircraft electrical power to OFF. Obey all relevant WARNINGS and CAUTIONS detailed in Maintenance Manual PSM 1 ---84 ---2. (2) Refer to Aircraft Maintenance Manual 1 ---84 ---2 TASK 32 ---00 ---00 ---840 ---801 and open and lock the nose and main landing gear doors.

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.. .. .. WARNING: MAKE SURE THAT THE LOCKPINS ARE INSTALLED IN THE MAIN LANDING GEAR. MAKE SURE THE NOSE GEAR LOCK IS ENGAGED. IF THIS IS NOT DONE, THE LANDING GEAR CAN ACCIDENTALLY RETRACT. THIS CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT.
WARNING: BE SURE THAT THE HYDRAULIC PRESSURE IS OFF, AND THAT THERE IS NO PRESSURE IN THE HYDRAULIC SYSTEM. IF YOU DO NOT DO THIS YOU CAN CAUSE INJURIES TO PERSONS AND DAMAGE TO THE EQUIPMENT.
B. Procedure (1) Remove and discard pushrod 83232012 ---001 from the nose landing gear forward door as follows: (Refer to Maintenance Manual PSM 1 ---84 ---2 Chapter 32 ---31 ---61 Task 32 ---31 ---61 ---000 ---801 for access location and to drawing 8MK4279) (a) Disconnect one end of the pushrod from the bellcrank by removing one cotter pin MS24665 ---153, one nut MS14145L5, one washer AN960 ---516, one washer AN960 ---516L, one bolt NAS1105 ---12D and one bushing NAS75 ---5 ---006. Keep all hardware except for washer AN960 ---516 and cotter pin. (b) Disconnect the other end of the pushrod from the door attachment bracket by removing one cotter pin MS24665 ---153, one nut MS14145L5, one washer AN960 ---516 and one bolt NAS1105 ---20D. Keep all hardware except for washer and cotter pin. (2) After removing each defective Pushrod (P/N 83232012 ---001) cut each part into two pieces in a way that will render them UNSERVICEABLE, wire lock the two pieces together. Tag the parts and dispose them as instructed by your Local Airworthiness Authority. (3) Install and rig new pushrod 83232012 ---951 to the nose landing gear forward door as follows: (Refer to Maintenance Manual PSM 1 ---84 ---2 Chapter 32 ---31 ---61 Task 32 ---31 ---61 ---400 ---801 for rigging instructions and to drawing 8MK4279) (a) Connect one end of the pushrod to the door attachment bracket using one nut MS14145L5, one new washer AN960 ---516 and one bolt NAS1105 ---20D. Torque nut 40 to 80 inch pounds and lock with new cotter pin MS24665 ---153.

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.. .. .. (b) Connect the other end of the pushrod to the bellcrank by using one nut MS14145L5, one new washer AN960 ---516, one washer AN960 ---516L, one bolt NAS1105 ---12D and one bushing NAS75 ---5 ---006. Torque nut 50 to 70 inch pounds and lock with new cotter pin MS24665 ---153. C. Close Out (1) Remove all tools and equipment from the work area. (2) Perform an operational test of the Nose Landing Gear Doors per Maintenance Manual PSM 1 ---84 ---2 Task 32 ---31 ---00 ---710 ---801. (3) On incorporation of this ModSum, make an entry that conforms to local regulatory requirements in the applicable logbook(s). Enter component serial numbers if applicable. Enter this ModSum number only after complete and functional incorporation of all work defined in this service bulletin.

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### This Page Intentionally Blank 1Nov 2006 SERVICE BULLETIN (SB) --- RECORD OF INCORPORATION --- Q SERIES DASH 8 AIRCRAFT To: Partner Data Co ---Ordinator (Toronto) From: Bombardier Aerospace Regional Aircraft Company: Phone: (1) 416 375 3534 Phone: Extn: Facsimile: (1) 416 375 4538 Facsimile: Date: E --mail:partner.data.ra.techpubs@aero.bombardier.comE --mail: The data that you provide below will help us record the incorporation of this modsum and the aircraft effectivity in the maintenance manual. Operator: Service Bulletin:

__________________Revision:

_________ Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: Aircraft Serial Number: Model Number: Date Bulletin Completed: 

## Fax this sheet to (1) 416 375 4538 or PDF to: partner.data.ra.techpubs@aero.bombardier.comNov 2006 SERVICE BULLETIN (SB) COMMENT SHEET --- Q SERIES DASH 8 AIRCRAFT To: SB Focal (Toronto) “Bob Barriault” From: Bombardier Aerospace Regional Aircraft Company: Phone: (1) 416 375 4078 Phone: Extn: Facsimile: (1) 416 375 4538 Facsimile: Date: E --mail:bob.barriault@aero.bombardier.com E --mail: Select appropriate box(es) and add comments or suggestions you would like us to know that may enhance the quality of our service bulletins. Service Bulletin: Revision: ModSum: 1. PLANNING INFORMATION V Effectivity V Reason V Description V Compliance VApproval V Manpower V Material VWeight and Balance V Electrical Load VTooling V References V Publications Affected 2. MATERIAL INFORMATION V Kit Content V Special Tools/Equipment V Parts to Modify Spares V Consumables V Disposition of Existing Parts V Other 3. ACCOMPLISHMENT INSTRUCTIONS V Job Set ---Up V Procedure V Close---Out VTest V Illustration(s) V Other 4. COMMENTS, REMARKS, SUGGESTIONS



## Fax this sheet to (1) 416 375 4538 or PDF to: bob.barriault@aero.bombardier.com